Four forces are being applied to move an object to the left. force 1 is pushing to the right at 200n. force 2 is pushing to the left at 500n. force 3 is pushing to the right at 100n. force 4 is pushing to the left at 50n. what's the net force acting on this object?
a.0n
b.650n
c.850n
d.250n

The answer is D.250N 
You start at Zero since no force is being applied to the object. If you move it one way, it starts the positive force. Go another way harder, it becomes a negative force. What I did here was 0+200-500+100-50. It will come out as a negative but you could ignore that because you cannot have a completely negative force as a final result. 

Heyhonestly, probably not. humans have always had a tendency to waste things. whether it's food, cosmetic, infrastructure, or our abandoned constructions,the landscape is littered with the refuseof man. archaeology wouldn't be a developed discipline if humans didn't leave things behind. in a way it makes us human

hope it mark me as brainlieast.